Bluish-red azo dyestuff.



1,001,458. I Draining.

4 TED STATES PATENT ()FFICE,

KARL soHmMAQI-IERQQF' HocHs'r-oN-TnE-MAIN, AND 3101mm) Lnoroimfnr Hoo'H AssIGNoRs 'I'O FARBWEBKE vorm. MISTER HEIM-ON-THE-MAIN, GERMANY,

LUcIUs a nntmme, F HooHsT-oN 'THE-MAIu, GERMANY, .A' coerce-lemon OF GERMANY.

To all whom it may concern:

Be itknown that we, Kn; .L Ph. D., chemist, and Eleni-um chemist, citizens of the Empire'oi."

"sulfonicacid ScmnimoHnR, LEOPOLD,

Germany, residing at Hiichst-on-the-Main, and 'Hochheim-on-the-Main, Germany, reepectively, have invented certain new and useful Improvements in Bluishlled Azo Dyestufi', of which the following is a specication;

*WVe have found that by combining the diazo compound of fi-nitro-Q-mnino-1-benzyl- (J l-I, (NO NIL) GH SU H with-2:3-oxynaphthoic acid, a bluish-red azo lows vent-ion: 25.4

' dyestnfi' is obtained which is Very valuable for the preparation of color lakes. This d estufi' surpasses the analogous dyestufl, o te med from the corresponding n1tmn1- linsulfonic acid, by its fastnessto light.

The formula of the new dyestulf is as fol- The following ekample illustrates the inartsby weight of sodium 5knitro-2-amino-1 benzylsulfonate are diazotlzed by means of 6,9,parts of sodium nitrite and parts of.lhydrochloric acid of 20? Baum specific gravity and the'magwis is in- BLUISHJHJD AZO DYESTUFF Patented Aug. 212, 19i-1.

Specification of Letters Patent. Application filed October 10, 1910.

and20 Serial No. 586,386.

t'roduced While stirring into a solution of 23.5parts of (ii-sodium 2:3-oxynaphthoate parts of sodium carbona'tefThe combination occurs Within a short The mass is then gently heated and filtered. \Vhen dry the dyestuff forms 21- .red owder, difiicult'y soluble in water-end inso ublein alcohol. It dissolves in concentrated sul furic acid .to a bluish-red solution The calcium salts and barium salts of the-dyest'nfli are insoluble in water.

Havingnow described We claim is:

As a new product, the azo dyestufi' obtainable by combining diazotized (S-nitro- 2-amino-l-benzyLsulfonic acid with 2.3-oxy naphthoic'agid, which is split into diaminobenzylsulfoilic acid and aminooxynaphthoic acid, being a bluish-red powder, difficultly soluble in Water, insoluble in alcohol, soluble in concentrated sulfuric acid to abluish-red solution and forming insoluble calcium salts and barium salts. T a

In testimony whereof, we afiixrour signatures in presence ofltwo witnesses.

KARL SCHIRMACHER. RICHARD LEOPOLD. Vvitnesses:

JEAN 'GRnNn, CARL GRUND.

time

our invention what 

